High-quality (1 −
x)(Mg
0.95Co
0.05)
2(Ti
0.95Sn
0.05)O
4–
x(Ca
0.8Sm
0.4/3)TiO
3 ceramics were prepared by solid-state reaction. The products were characterized by scanning electron microscopy, X-ray diffraction, and network analyzer. (Mg
0.95Co
0.05)
2(Ti
0.95Sn
0.05)O
4 (MCTS) has a dielectric constant (ε
r) of ∼14.7, a high quality factor (
Q×
f) of ∼330,134 GHz, and a temperature coefficient of resonant frequency (τ
f) of ∼−46 ppm/°C. To produce a temperature-stable material, (Ca
0.8Sm
0.4/3)TiO
3 (CST) which has a large positive value τ
f of +400 ppm/°C, was added to MCTS. 0.84 MCTS–0.16CSTs an excellent combination of microwave dielectric properties: ε
r ∼ 22.5,
Q×
f ∼ 206,000 GHz (at 9 GHz), and τ
f ∼ −0 ppm/°C sinter at 1325°C, and can be utilized in the fabrication of microwave devices.
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